U.S. President Barack Obama speaks on the third day of the 2016 Democratic National Convention in Philadelphia, Pennsylvania, the United States, July 27, 2016. (Xinhua/Bao Dandan)
U.S. President Barack Obama speaks on the third day of the 2016 Democratic National Convention in Philadelphia, Pennsylvania, the United States, July 27, 2016. (Xinhua/Bao Dandan)
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